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Reports utility classes that aren't <code>final</code> or <code>abstract</code>.
<p>Utility classes have all fields and methods declared as <code>static</code>.
Making them <code>final</code> prevents them from being accidentally subclassed.</p>
<p><b>Example:</b></p>
<pre><code>
  public class UtilityClass {
    public static void foo() {}
  }
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  public final class UtilityClass {
    public static void foo() {}
  }
</code></pre>
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